The description from Blog-related RSS feeds is hardcoded in English

Set your wiki to be multilingual. Some RSS feed pages will be translated if you change the language. For example:

http://localhost:8080/xwiki/bin/view/XWiki/WatchListRss?xpage=plain&outputSyntax=plain&language=fr

http://localhost:8080/xwiki/bin/view/Main/WebRss?xpage=plain&outputSyntax=plain&language=es

The description from the Blog-related feeds is always displayed in English. Try these for example:

http://localhost:8080/xwiki/bin/view/Blog/BlogRss?xpage=plain&language=it

http://localhost:8080/xwiki/bin/view/Blog/CategoryRss?xpage=plain&language=de

http://localhost:8080/xwiki/bin/view/Blog/GlobalBlogRss?xpage=plain&language=fr